A、What are the differences between marketing and cost-effective publicity? B、Could you say something on the subject of cost-effe

I really cannot decide whether to dig up information from the Internet for our annual report over the weekend, or go shopping with my friends. But maybe a break would do me good.

The subject of the conference is marketing and sales. And I was wondering if you could give us a talk, say, fifty minutes or so, on cost-effective publicity.